Radio tube socket



Nov. 30, 1948. A. w. FRANKLIN 2,455,300

RADIO TUBE SOCKET Filed Dec. 23, 1944 3 Sheets-Sheet 1 2- PM. III

INVENTOR ALBERT W. FRANKLIN Nov. 30, 1948. A. w. FRANKLIN RADIO TUBE SOCKET 3 Sheets-Sheet 2 Filed Dec. 23, 1944 INVENTOR ALBERT w. FRANKLIN ATTORNEY5.

Nov; 30, 1948.

Filed Dec. 23, 1944 A. W. FRANKLIN HADIO TUBE SOCKET 3 Sheets-Sheet 3 INVENTOR W. FRANKLIN ATTORNEYS Patented Nov. 30, 1948 UNITED STATES PATENT OFFICE- RADIO TUBE SOCKET Albert W. Franklin, New York, N. Y.

Application December 23, 1944, Serial No. 569,579

2 Claims.

This invention relates to improvements in radio tube sockets and socket tenminal prong receiving clips therefor.

An object of this invention is to provide an extremely simple and inexpensive modification of vacuum tube prong receiving clips to facilitate grounding of the socket on the-chassis of the equipment of which it is to be a part.

Another object of the invention is to provide a novel construction by means of which the terminal clip in which the screen grid terminal prong socket is received is shielded and/or grounded.

Other and more detailed objects of the invention will be apparent from the following disclosure of the several embodiments thereof illustrated in the drawings.

This invention resides substantially in the combination, construction, arrangement and relative location of parts, all as will be described in detail below.

In the accompanying drawings,

Figure 1 is a perspective view of a radio tube socket mounted on a support and embodying the grounding feature of this invention;

Figure 2 is a perspective view of the terminal clip modified for grounding;

Figure 3 is a cross-sectional view taken on the line 33 of Figure 1;

Figure 4 is a plan view of the structure by means of which the shield for the screen grid terminal clip of a radio tube socket'is shielded from adjacent clips and grounded;

Figure 5 is a perspective view of the shielding structure;

Figure 6 is a plan view of the stamping from which the shield is made;

Figure 7 is a cross-sectional view taken on the line 1--| of Figure 4;

Figure 8 is a plan view of the stamping of a modified shield arranged for grounding independently of the clip to which it is attached;

Figure 9 is an elevational view of this modification as applied to a radio tube socket; and

Figure 10 is a detailed cross-sectional view taken approximately on the line Illl of Figure 8.

As is well known, it is common to provide some means for grounding at least one of the prong receiving clips of a radio tube socket. In the most common form this grounding means comprises a separate wire which is individually soldered to the prong receiving clip to be grounded, and in turn soldered to some adjacent portion of the metal chassis which supports the socket.

. 2 The construction illustrated in Figures 1 to 3,

inclusive, provides an integral grounding tab' forming part of the prong receiving clip to be grounded-by means of which a ground connection to the chassis may be quickly made by means of a single soldered connection through the agency of that tab. As illustrated in these figures, a portion of the metal chassis is indicated at I0, upon the underside of which the socket may be attached in accordance with usual practice by means of rivets through the openings 20. As illustrated, the socket includes a pair of super,- posed plates II and II of insulating material secured together by means of the riveted eyelets I9. A plurality of prong receiving terminal clips l3 are mounted on this base. As illustrated, they are all the same with the exception of the clip which has been indicated by the reference numeral l4 and shown in greater detail in Figure 2. This clip comprises a longitudinally slotted tubular portion l5 integral with a uniting web l6 and the right angled soldering lug or terminal l1. These clips are secured in the socket by passing the portions I5 and I! through suitably shaped openings in the insulating-plate II, so that the connecting web portion I6 is clamped between the insulating plates H and i2. These features are of usual construction in this art.

The clip to be grounded differs from those just described by striking out of the soldering lug IS a tab l8 which lies in'the plane of the web l6, and thus extends exteriorly of the superposed insulating plates II and I2, as is clear from Figures 1 and 2. The extending end of the tab [8 is bent downwardly into contact with the adjacent portion of the chassis l0 and soldered thereto, as indicated in Figure 3. Thus the 'prong receiving clip to be grounded is quickly and easily grounded to the chassis by means 01 a single soldered connection at the tab I8 which, being integral with the clip, insures that the right clip is grounded.

The principles of this invention have been carried forward into the modifications illustrated in Figures 4 and 10, inclusive. One of these modiflcations is illustrated in Figures 4 to 7, inclusive. A chassis portion In is illustrated as before, and the socket is generally similar in construction to that previously described. In this case the screws or rivets 20' are shown for attaching the socket to the underside of the chassis. The prong receiving clips l3 are the same as before, and in this case a clip Id like that shown in Figure 2 is employed and grounded by means of its tab l8, as in the previous case. The feature of this construction is the grounded shield by means of which the prong receiving clip i3 is electromagnetically and electrostatically shielded from the 7 other clips by means of a metal shield 2|. The

clip I3 is the one which normally receives the prong of the tube connected to the screen grid of the tube. The shield 2| is shown in Figure 6. It has an aperture 22 punched therein and a T-shaped incision 23 cut therethrough, as shown. It is provided with a short ear 25 and is bent up into the form clearly illustrated in Figures 4 and 5. The T-shaped slit 23 provides for the ears 26 and the aperture 22 permits riveting of the shield to the grounded clip M by means of the rivet 21, see Figure 4. The ears 2B engage the adjacent face of the socket plate II to impart transverse rigidity to the shield. The lug projects into a suitably positioned rectangular slot in the insulating plate so as to anchor the free end of the shield 2| in a manner which will be obvious.

It will be seen from this description that the shield 2| electrically isolates the clip 13 from the other clips and the shield is simultaneously grounded by reason of its riveted attachment to the grounded clip M, which clip is the same as that previously described.

In the modification of Figures 8 and 9 the only difference is that in this socket all of the clips 3 are the same, that is no clip like that of Figure 2 is used. In this case the shield 2| only differs from the shield of Figure 6 in that it is made long enough so as to project over the edge of the socket plate H and the downwardly extending tab 29 has its terminal end bent over at right angles into contact with the chassis l0 and is soldered thereto so that the shield is anchored at this end and grounded. The shield 2| being riveted to the clip I4 also grounds it. The clip I3 is,

of course, shielded by it, as in the previous case. The ear 25 is provided for seating in a slit in the insulating plate H, as in the previous case, so as to anchor the shield and prevent bending of it prior to the mounting of the shield on the chassis. Of course, the soldered tab 29 also serves its purpose, but is ineffective until the socket is put i into use, and so it is preferable to provide the ear 25 by protecting the shield against damage prior to putting the socket into use.

From the above description it will be apparent to those skilled in the art that the subject matter of this invention is capableof some variation as ing a struck out grounding tab integral therewith extending exteriorly of the plates in the plane of the web thereof.

2. A radio structure of the type described, a tube socket comprising an insulating support, and a plurality of prong receiving clips mounted on said support, a shield surrounding one of said clips and conductively connected to an adjacent clip, said shield having an integral grounding tab, and a conducting support to which said socket is attached and said grounding tab is conductively anchored.

ALBERT W. FRANKLIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,109,770 Franklin Mar. 1, 1938 2,169,962 Del Camp Aug. 15, 1939 2,200,332 Henning May 14, 1940 2,259,739 Del Camp Oct. 21, 1941 2,301,288 Knauf J r. et a1 Nov. 10, 1942 2,312,181 Matthews Feb. 23, 1943 2,377,893 Lorenzen June 12, 1945 FOREIGN PATENTS Number Country Date 359,130 Italy May 13, 1938 543,278 Great Britain Feb. 17, 1942 544,015 Great Britain Mar. 24, 1942 551,536 Great Britain Feb. 26, 1943 

